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DCT12S0A0S12NFA Datasheet(PDF) 11 Page - Delta Electronics, Inc. |
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DCT12S0A0S12NFA Datasheet(HTML) 11 Page - Delta Electronics, Inc. |
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11 / 19 page  DS_DCT12S0A0S03PFA_09172013 11 FEATURES DESCRIPTIONS (CON.) Remote Sense The DCT provide Vo remote sensing to achieve proper regulation at the load points and reduce effects of distribution losses on output line. In the event of an open remote sense line, the module shall maintain local sense regulation through an internal resistor. The module shall correct for a total of 0.5V of loss. The remote sense line impedance shall be < 10 . Vo Sense Vin GND RL Distribution Losses Distribution Losses Distribution Losses Distribution Losses Figure 28: Effective circuit configuration for remote sense operation Output Voltage Programming The output voltage of the DCT can be programmed to any voltage between 0.59Vdc and 5.5Vdc by connecting one resistor (shown as Rtrim in Figure 29) between the TRIM and GND pins of the module. Without this external resistor, the output voltage of the module is 0.59 Vdc. To calculate the value of the resistor Rtrim for a particular output voltage Vo, please use the following equation: K Vo Rtrim 591 . 0 91 . 5 Rtrim is the external resistor in kΩ Vo is the desired output voltage. For example, to program the output voltage of the DNS module to 5.0Vdc, Rtrim is calculated as follows: K K Rtrim 34 . 1 591 . 0 0 . 5 91 . 5 Vo TRIM GND RLoad Rtrim Figure 29: Circuit configuration for programming output voltage using an external resistor Table 1 provides Rtrim values required for some common output voltages, By using a 0.5% tolerance trim resistor, set point tolerance of ±1.5% can be achieved as specified in the electrical specification. Table 1 Vo(V) Rtrim(KΩ) 0.590 Open 0.600 656.700 1.000 14.450 1.200 9.704 1.500 6.502 1.800 4.888 2.500 3.096 3.300 2.182 5.000 1.340 Certain restrictions apply on the output voltage set point depending on the input voltage. These are shown in the Output Voltage vs. Input Voltage Set Point Area plot in Figure 30. The Upper Limit curve shows that for output voltages of 0.9V and lower, the input voltage must be lower than the maximum of 14V. The Lower Limit curve shows that for output voltages of 3.8V and higher, the input voltage needs to be larger than the minimum of 4.5V. Figure 30: Output Voltage vs. Input Voltage Set Point Area plot showing limits where the output voltage can be set for different input voltages. |
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